Study on Laser-Induced Carbonization Conditions of Lignin/Polyacrylonitrile Composite Films

激光可引发生物质基碳源材料热解和重组，将其碳化为石墨烯或类石墨结构以制备精细图案化碳电极。本研究通过激光诱导碳化木质素/PAN复合膜，系统研究了木质素/PAN配比(1:1、1:2、1:3)、激光功率(P = 6%、7%、8%)和激光扫描速率(R = 10、25、40、55、70 mm/s)对碳层的影响。SEM、电阻热图、XRD和Raman测试结果表明，高PAN含量(PL3)、高激光功率(P ≥ 7%)和低激光扫描速率(R ≤ 25 mm/s)可制备致密小孔径碳层，且其石墨化程度较高，导电性较好；而低PAN含量(PL1、PL2)、低激光功率(P ≤ 6%)和高激光扫描速率(R ≥ 40 mm/s)可制备疏松、孔径分布宽碳层，且其石墨化程度较低，导电性较差。本研究为制备可持续图案化碳电极提供了定制化方案和新思路。Laser irradiation drives the pyrolysis and structural reorganization of biomass based carbon precursor materials, converting them into graphene or graphite-like architectures to enable the fabrication of fine patterned carbon electrodes. This study investigated the effects of lignin/PAN ratios (1:1, 1:2, 1:3), laser power (P = 6%, 7%, 8%), and laser scanning rates (R = 10, 25, 40, 55, 70 mm/s) on the carbon layers in carbonized lignin/PAN composite films. SEM, resistance heatmaps, XRD and Raman spectra demonstrated that dense carbon layers with smaller pores, higher graphitization and superior conductivity were produced with higher PAN content (PL3), higher laser power (P ≥ 7%) and lower scanning rates (R ≤ 25 mm/s). Conversely, loose carbon layers with wide pore size distribution, lower graphitization and poor conductivity were produced with lower PAN content (PL1, PL2), lower laser power (P ≤ 6%), and higher scanning rates (R ≥ 40 mm/s). This work proposes a customizable strategy for fabricating sustainable patterned carbon electrodes tailored to diverse requirements.